What is zero and wht from where it comes

Triangle xyz has vertices x(1,3), y(0,0)

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212